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/*
* Author: Sven Gothel <sgothel@jausoft.com>
* Copyright (c) 2020 Gothel Software e.K.
* Copyright (c) 2020 ZAFENA AB
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef L2CAP_COMM_HPP_
#define L2CAP_COMM_HPP_
#include <cstring>
#include <string>
#include <memory>
#include <cstdint>
#include <vector>
#include <mutex>
#include <atomic>
#include "UUID.hpp"
#include "BTTypes.hpp"
/**
* - BT Core Spec v5.2: Vol 3, Part A: BT Logical Link Control and Adaption Protocol (L2CAP)
*/
namespace direct_bt {
class DBTDevice; // forward
class L2CAPComm {
public:
enum State : int {
Error = -1,
Disconnected = 0,
Connecting = 1,
Connected = 2,
};
static std::string getStateString(const State state);
private:
static int l2cap_open_dev(const EUI48 & adapterAddress, const uint16_t psm, const uint16_t cid, const bool pubaddr, const bool blocking);
static int l2cap_close_dev(int dd);
State state;
std::shared_ptr<DBTDevice> device;
const uint16_t psm;
const uint16_t cid;
const bool pubaddr;
const bool blocking;
int _dd; // the l2cap socket
volatile bool interruptReadFlag; // for forced disconnect
public:
L2CAPComm(std::shared_ptr<DBTDevice> device, const uint16_t psm, const uint16_t cid, const bool pubaddr=true, const bool blocking=true)
: state(Disconnected), device(device), psm(psm), cid(cid), pubaddr(pubaddr), blocking(blocking), _dd(-1), interruptReadFlag(false) {}
~L2CAPComm() { disconnect(); }
std::shared_ptr<DBTDevice> getDevice() { return device; }
State getState() const { return state; }
std::string getStateString() const { return getStateString(state); }
/** BT Core Spec v5.2: Vol 3, Part A: L2CAP_CONNECTION_REQ */
State connect();
bool disconnect();
bool isOpen() const { return 0 <= _dd; }
int dd() const { return _dd; }
int read(uint8_t* buffer, const int capacity, const int timeoutMS);
int write(const uint8_t *buffer, const int length);
};
} // namespace direct_bt
#endif /* L2CAP_COMM_HPP_ */
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